Datasheet MAX845 (Maxim)
| Manufacturer | Maxim |
| Description | Isolated Transformer Driver for PCMCIA Applications |
| Pages / Page | 16 / 1 — EVALUATION KIT. AVAILABLE. Isolated Transformer Driver. for PCMCIA … |
| File Format / Size | PDF / 219 Kb |
| Document Language | English |
EVALUATION KIT. AVAILABLE. Isolated Transformer Driver. for PCMCIA Applications. MAX845. _______________General Description
Model Line for this Datasheet
Text Version of Document
19-0372; Rev 4; 10/97
EVALUATION KIT AVAILABLE Isolated Transformer Driver for PCMCIA Applications MAX845 _______________General Description ____________________________Features
The MAX845 provides an isolated power supply small ♦
Transformer Driver for Ultra-Thin 5V-µs Transformers
enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped trans- ♦
Isolated DC-to-DC Power Supply for PCMCIA
former primary from a 5V or 3.3V DC power supply. The
Applications
secondary can be wound to provide any isolated posi- ♦
450kHz Minimum Switching Frequency
tive or negative voltage at powers up to 750mW. ♦
Ultra-Low Input Supply Current Ripple
The MAX845 consists of an oscillator followed by a tog- gle flip-flop. The flip-flop generates two 50% duty-cycle ♦
Single +5V or +3.3V Supply
square waves, which are complementary at half the ♦ oscillator frequency (450kHz, min). These two signals
5µW Low-Power Shutdown Mode
drive the ground-referenced N-channel power switch- ♦
8-Pin SO and µMAX Packages
es. Internal circuitry ensures break-before-make action between the two switches. ♦
Low Output Ripple Permits Miniature Output Capacitors
A low-power shutdown disables both the switches and the oscillator, reducing power consumption. An evalua- tion kit (MAX845EVKIT-MM) is available to evaluate low- profile 5V 40mA and 5V 100mA applications.
________________________Applications _______________Ordering Information
PCMCIA Modem Cards
PART TEMP. RANGE PIN-PACKAGE
Isolated Data Acquisition MAX845C/D 0°C to +70°C Dice* Isolated Interface Power Supply MAX845ESA -40°C to +85°C 8 SO Noise-Immunity Communications Interface MAX845EUA -40°C to +85°C 8 µMAX Bridging Ground Differences *Contact factory for dice specifications. Medical Equipment Process Control Low-Power LAN Networks
__________Typical Operating Circuit ___________________Pin Configuration
VIN 5V TOP VIEW ON / OFF C1 4 6 OUTPUT SD V CR1 CC 1 5V @ 150mA D1 D1 1 8 D2 C2 GND1 2 7 GND2 MAX845 MAX845 FS 3 6 VCC 3 8 FS D2 T1 SD 4 5 N.C. FREQUENCY C3 SELECT GND1 GND2 2 7
SO/
µ
MAX
CR2
________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
EVALUATION KIT AVAILABLE Isolated Transformer Driver for PCMCIA Applications MAX845 _______________General Description ____________________________Features
The MAX845 provides an isolated power supply small ♦
Transformer Driver for Ultra-Thin 5V-µs Transformers
enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped trans- ♦
Isolated DC-to-DC Power Supply for PCMCIA
former primary from a 5V or 3.3V DC power supply. The
Applications
secondary can be wound to provide any isolated posi- ♦
450kHz Minimum Switching Frequency
tive or negative voltage at powers up to 750mW. ♦
Ultra-Low Input Supply Current Ripple
The MAX845 consists of an oscillator followed by a tog- gle flip-flop. The flip-flop generates two 50% duty-cycle ♦
Single +5V or +3.3V Supply
square waves, which are complementary at half the ♦ oscillator frequency (450kHz, min). These two signals
5µW Low-Power Shutdown Mode
drive the ground-referenced N-channel power switch- ♦
8-Pin SO and µMAX Packages
es. Internal circuitry ensures break-before-make action between the two switches. ♦
Low Output Ripple Permits Miniature Output Capacitors
A low-power shutdown disables both the switches and the oscillator, reducing power consumption. An evalua- tion kit (MAX845EVKIT-MM) is available to evaluate low- profile 5V 40mA and 5V 100mA applications.
________________________Applications _______________Ordering Information
PCMCIA Modem Cards
PART TEMP. RANGE PIN-PACKAGE
Isolated Data Acquisition MAX845C/D 0°C to +70°C Dice* Isolated Interface Power Supply MAX845ESA -40°C to +85°C 8 SO Noise-Immunity Communications Interface MAX845EUA -40°C to +85°C 8 µMAX Bridging Ground Differences *Contact factory for dice specifications. Medical Equipment Process Control Low-Power LAN Networks
__________Typical Operating Circuit ___________________Pin Configuration
VIN 5V TOP VIEW ON / OFF C1 4 6 OUTPUT SD V CR1 CC 1 5V @ 150mA D1 D1 1 8 D2 C2 GND1 2 7 GND2 MAX845 MAX845 FS 3 6 VCC 3 8 FS D2 T1 SD 4 5 N.C. FREQUENCY C3 SELECT GND1 GND2 2 7
SO/
µ
MAX
CR2
________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
